.index {
    width: 100%;
    box-sizing: border-box;
    display: grid;
    grid-template-columns: repeat(3, 100px);
    grid-template-rows: repeat(3, 100px);
    grid-gap: 30px, 30px;
    overflow-x: scroll;

    .index_item {
        border: 1px solid red;
    }
}